摘要
利用动态塑性变形(DPD)和准静态压缩变形(QSC)技术对纯钛圆柱样品进行对比压缩试验,研究了不同应变速率下纯钛形变孪晶和微结构演变。结果发现:2种变形方式的变形机制相似,低应变时以形变孪生为主,孪生饱和后转变为位错滑移主导;高应变速率促进了形变孪晶的产生,激发{4211}压缩孪晶的形成,同时使变形机制转变临界应变提前至0.2;纯钛在高应变速率和高应变(ε≥0.6)下出现绝热剪切带(ASB)。
The cylindrical pure Ti specimens were compressed by dynamic plastic deformation（DPD） and quasi-static compression（QSC）.The deformation twins and microstructure evolution at different strain rates were investigated.The results show that the deformation mechanisms of DPD and QSC pure Ti are similar, i.e., deformation twinning is dominant at low strains, and however, dislocation slip becomes the main deformation mode after twins reach saturation.The high strain rate could encourage the formation of deformation twinning and stimulate the formation of the { 4211 } compression twins.Meanwhile, the high strain rate results in the critical strain of deformation mechanism decreasing to 0.2.Adiabatic shear bands（ASBs） are formed in pure Ti at high strain rate and high strain（ε≥0.6）.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第7期1730-1734,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金项目(51071183
50890170
51271208)
